Dad and Mom have to read all food labels very closely now. When Dr. Barrett took me off all sodium, they examined all my supplements for sodium. Almost none of the supplements listed the amount of sodium. They then looked for ingredients with sodium. None of the food items, e.g., the raw food and/or kibble listed any ingredients with sodium. One of the supplements didn't list any sodium, BUT IT HAD KELP which can be quite high in salt, so of course I can't have that any more. Be careful of anything with sea food, kelp, anything from the ocean.
The moral is to pay attention to ALL ingredients, not just look for ingredients starting with or containing sodium in their name.